/*
 *  Copyright 2005 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.forum.topic;

import com.blandware.atleap.common.ForumModuleConstants;
import com.blandware.atleap.model.forum.Post;
import com.blandware.atleap.model.forum.Topic;
import com.blandware.atleap.search.SearchManager;
import com.blandware.atleap.service.forum.ForumManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.forum.TopicForm;
import com.blandware.atleap.webapp.util.core.CacheUtil;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * <p>Deletes forum topic.</p>
 * <p><a href="DeleteTopicAction.java.html"><i>View source</i></a></p>
 *
 * @author Roman Puchkovskiy <a href="mailto:roman.puchkovskiy@blandware.com">
 *         &lt;roman.puchkovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.2 $ $Date: 2008/04/29 17:51:51 $
 * @struts.action path="/forum/topic/delete"
 * name="topicForm"
 * scope="request"
 * validate="false"
 * roles="forum-topic-delete"
 * @struts.action-forward name="showForum"
 * path="/forum/forum/show.do"
 * redirect="true"
 * @struts.action-forward name="unsatisfiable"
 * path="/forum/forum/show.do"
 */
public final class DeleteTopicAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		TopicForm topicForm = (TopicForm) form;
		Long topicId = null;
		if ( !GenericValidator.isBlankOrNull(topicForm.getId()) ) {
            topicId = Long.valueOf(topicForm.getId());
		} else {
			if ( log.isWarnEnabled() ) {
				log.warn("Missing topic ID. Returning to forums...");
			}
			return mapping.findForward("showForum");
		}

		ForumManager forumManager = (ForumManager) getBean(ForumModuleConstants.FORUM_MANAGER_BEAN);
		Topic topic = forumManager.retrieveTopic(topicId);

		if ( topic == null ) {
			// topic not found. it might be deleted by someone else
			ActionMessages errors = new ActionMessages();
			errors.add("topicNotFound", new ActionMessage("forum.topic.errors.notFound"));
			saveErrors(request, errors);
			return mapping.findForward("showForum");
		}

        List posts = new ArrayList(topic.getPosts());
		forumManager.deleteTopic(topicId);

		// unindex topic posts
		SearchManager searchManager = SearchManager.getInstance(request.getSession().getServletContext());
        for (Iterator i = posts.iterator(); i.hasNext(); ) {
            Post post = (Post) i.next();
            searchManager.unIndexPage(post.getUri(), request);
            CacheUtil cacheUtil = CacheUtil.getInstance(request);
            cacheUtil.flushLocalizableFieldValueCache(post.getId());
        }

		return mapping.findForward("showForum");
	}
}
